Too much protein?

A more realistic, at least for most populations, intake for protein is about 100% of your lean mass, in lbs, during a caloric deficit. So if your lean mass is 100 lbs, then you'd consume approximately 100 grams of protein. For muscular hypertrophy, whereby you'd consume a surplus of calories, a bit more (120 to 140%) is beneficial. I don't like the "weight" rule since heavier persons would consume unnecessarily large amounts.

Regarding optimal caloric intake, it's based on how much fat mass you have to lose. The rule of thumb is: the more total fat mass one has to lose, the larger the caloric deficit can be sustained since a greater amount of fat can be burned in 24 hours. In contrast, the less total fat mass one has, the less fat mass can potentially be used as fuel in a single day. Two examples: Person A has 40 lbs of fat to lose and can pursue a deficit of 500 calories to lose 1 lb per week. Person B has 15 lbs of fat to lose and may pursue a 250 calorie deficit to lose 0.5 lb per week.

Ideally, people should really try to establish their maintenance needs prior to reducing calories so they are basing calculations on individual and real world data at true baseline. If they have already cut calories for a few days or weeks, they can calculate estimates using TDEE calculators and eat 10% of the given amount. for several weeks. During this time, you'd monitor to see what response occurs - whether you remain relatively weight stable or lose weight (if so, what rate per week). Also, using a digital food scale and consistently logging everything you eat will illustrate a more accurate estimate as to how much you are eating compared to strictly using measuring cups or eye-balling portions.

It's not going to hurt to eat more protein than you have your macros set at. When lifting it would be better to get a little more than not enough.

Also you should probably try to focus on one goal at a time, lowering body fat then building more muscle. Having said that, you should continue to lift heavy while dieting to preserve the lean muscle mass you have. Once you are down to your desired BF% then focus on building more muscle while keeping a close check on your BF%. You will gain some fat while gaining muscle but you can keep it to a minimum.

It is possible to lose fat and build muscle at the same time, it's called body recomp, but it is painfully slow.